Fix broken specs

python/helpers/lib/parser.py

@@ -54,9 +54,9 @@ def version_from_req(specifier_set):
         project_toml['dependencies']
     )
 
-    optional_dependencies_toml = project_toml['optional-dependencies']
+    if 'optional-dependencies' in project_toml:
+        optional_dependencies_toml = project_toml['optional-dependencies']
 
-    if optional_dependencies_toml:
         for group in optional_dependencies_toml:
             group_dependencies = parse_toml_section_pep621_dependencies(
                 pyproject_path,

python/spec/dependabot/python/file_parser/pyproject_files_parser_spec.rb

@@ -289,5 +289,15 @@
 
       its(:length) { is_expected.to eq(0) }
     end
+
+    context "with optional dependencies" do
+      let(:pyproject_fixture_name) { "optional_dependencies.toml" }
+
+      subject(:dependencies) { parser.dependency_set.dependencies }
+
+      # fixture has 1 runtime dependency, plus 4 optional dependencies, but one
+      # is ignored because it has markers
+      its(:length) { is_expected.to eq(4) }
+    end
   end
 end

python/spec/fixtures/pyproject_files/optional_dependencies.toml

@@ -0,0 +1,21 @@
+[build-system]
+requires = ["flit_core >=3.2,<4"]
+build-backend = "flit_core.buildapi"
+
+[project]
+name = "pkgtest"
+authors = [{name = "Sample", email = "sample.project@example.org"}]
+license = {file = "LICENSE"}
+classifiers = ["License :: OSI Approved :: MIT License"]
+dynamic = ["version", "description"]
+dependencies = [
+   "ansys-templates==0.3.0",
+]
+
+[project.optional-dependencies]
+socks = [ 'PySocks >= 1.5.6, != 1.5.7, < 2' ]
+tests = [
+  'ddt >= 1.2.2, < 2',
+  'pytest < 6',
+  'mock >= 1.0.1, < 4; python_version < "3.4"',
+]

python/spec/fixtures/pyproject_files/standard_python.toml

@@ -11,11 +11,3 @@ dynamic = ["version", "description"]
 dependencies = [
    "ansys-templates==0.3.0",
 ]
-
-[project.optional-dependencies]
-socks = [ 'PySocks >= 1.5.6, != 1.5.7, < 2' ]
-tests = [
-  'ddt >= 1.2.2, < 2',
-  'pytest < 6',
-  'mock >= 1.0.1, < 4; python_version < "3.4"',
-]